How to make RxH3 Maps

Below is a short description of how to make RxH3 maps followed by a more detailed explanation.

Before holography (or earlier in the night) check whether temperatures are recorded:
There should be two data files in /jcmtdata/raw/surface/temperatures/yyyymmdd, e.g.:
ulili:~> ls /jcmtdata/raw/surface/temperatures/20050126
26-Jan-2005 26-Jan-2005.lostSensors
If there are no files, ask JGW or MJR to restart the temperature monitoring.

move TMU to RxH3
Login on mamo as operator
rxh3_eng & to see engineering screen
(temperature should be about 32C, if it is not see below)
rxh3_dev
load
init
stdMap 1 (type two times 1 to start map) for 80 GHz map
(stdMap 2 for 160 GHz map)
exit
In ICL move SMU Z in small steps back to 0 (msmu)

More Details
There are two predefined maps, one 80 GHz map (taking 50 minutes), and one 160 GHz map (taking 1h40m).

Examples of such maps are here

Start TCS as usual; if it is already running, it is no more necessary to restart the TCS before going to RxH3,
but put pointing offsets to 0,0 (with setoff).

Put the TMU to RxH3

slogin in Mamo as operator (when using mamo itself open a console)

Mamo> rxh3_eng &

Starts the engineering screen.
The 'Gunn temperature' should be about 31.5-32.5C (range is not well-defined), if not the map may not start,
or will stop in the middle of the map, trying more then has no use.
This temperature can be slightly modified by changing the fan speed (see below).
There is another temperature sensor from another position inside the receiver which should show 27-28C.
This one can be measured with the 'Fluke 52'. This is a small device which is at top of the
red cupboard opposite to the door in the receiver preproom. Connected to RxH3 you see a thin wire
with a small plug. You can stick it into the Fluke 52 and turn it on, and then press on T1 or T2 (depending where you plug it in).
If this temperature is much too high or too low you can change it by increasing or decreasing the fan speed ('clock' at upper left of RxH3).
It is normally at 2 o'clock or 1h30. If you make the speed too high the 'Gunn temperature' will also drop (below 32C).

It is no more necessary to stop the wvm on mamo or do cleanup before holography.

Mamo> rxh3_dev
Starts the program
dtcl> load
("enter" in order to get the prompt)
dtcl> init

Below (at bottom of this page) there is a list of available commands.

To do the 80 GHz map type:

dtcl> stdMap 1
Then there is a question whether you want to move telescope, smu, and tmu - answer yes (1)
And a question to start the map or abort - type 1 to start
(maybe you want to review the map parameters - see below, then type 0 and
dtcl> setPars
or
dtcl> listPars
and then
dtcl> map
)

To do the 160 GHz map type:
dtcl> stdMap 2
Further as above.

During the map you can check the absolute SMU position in screen S3. It should be -0.11 3.73 19(+/-2 or so) for Z-focus 31
(Z is temperature dependent)

To abort a map type cntr C, then enter rxh3_dev again and type exit
to exit properly and enter rxh3_dev again (load and init)

During the map there may appear messages about Gunn not locked or
(possibly) too low or high temperature, but these can be ignored.

Making a map the telescope scans in Azimuth over about 4800" (which takes 12 seconds per row)
and goes back to the centre of the map for a calibration measurements after every 20 rows.

When a map is finished, some diagnostic plots appear. Enter a return in the small window.
If you don't want to see them, the plotting can be killed (the 160 GHz plot takes time).

If stdMap does not work for some reason the parameters can be entered by hand.
I give the value for 80 GHz (in brackets the ones for 160 GHz)

dtcl> setPars
(questions follow for parameters)
row length 4840 (4820)
row velocity 400
row spacing 40 (20)
number of rows 121 (241)
reverse or not 0
raster tilt 0.0
frequencies file name 16freqs.dat
number of frequencies 16
observing frequency 80 (160)
source step period 4 (2)
oversample factor 1
freerun or tel trigger 0
number of rows per cal 20
calibration period 2000
cal x-offset 307 (483)
cal y-offset 0 (0)
horizontal or vertical 1
telescope Z focus 31
ukirt on or off 1
allow tel,smu,tmu to move 1

then type
dtcl> map
to start the map

the current set of commands is:

help - show this list

Observing Commands...

exit - delete Unix tasks and Drama networking and exit script
gridMap - start a grid map
init - initialise the system tasks
listMaps - list the pre-defined map parameters
listPars - list the current system parameters
load - load the Unix tasks
map - start a map
setPars - define system and map parameters
stdMap - perform standard map

Engineering Commands...

freqband n - set freq band, n is 80 or 160 (GHz)
point - point the telescope at the UKIRT source
smu n - move the smu to position n
sxoff - switch the Ukirt source off
sxon n - switch the Ukirt source on, executing at n millisecs
sxpat file - load a frequency patern file
zenith - return the telescope to the zenith